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A221818 as a simple table

na(n)
10
24
316
491
5459
62429
712678
866380
9347305
101817234
119509123
1249756006
13260353922
141362310931
157128385902
1637299670925
17195172780250
181021252966367
195343766480365
2027961572573739
21146310575925354
22765578706008096

[0,4,16,91,459,2429,12678,66380,347305,1817234,
 9509123,49756006,260353922,1362310931,7128385902,
 37299670925,195172780250,1021252966367,
 5343766480365,27961572573739,146310575925354,
 765578706008096]